Thyjof



(No Model.)

T. B. CLATWORTHY.

SAFETY VALVE POR KITCHEN BoLBRs.

No. 491,238. Patented Feb. 7, i893.

UNTTno STnTns PaTnnT @Tries0 TllOltlAS B CLATWORTHY, CF TNATERBURY,CONNECTICUT, ASSIGNCR T() RANDOLPH dr CLOVES, CF SAME PLACE.

SAFETYBVALVE FOR SPECIFICATION forming part of Letters Patent No.4915238, dated February i?, 1893.

Application iiled April 19, 1892,

To all whom t may concern,.-

Be it known that I, THOMAS B. @Lara/oa THY,ot lVaterbury,in the countyof New Haveu and State ot' Connecticut, have invented a new and usefulimprovement in Safety- Valves for Kitchendoilers, of which the followingis a specification.

One object of my invention is to provide a safety valve for use inconnection with boilers 'which shall prevent the explosion of the boilerwhen the pipes become frozen, obstructed or when check valves are usedin the supply pipe from the water main. Q

A further object is to provide a safety valve which will not onlyprevent the bursting of the boiler by excessive pressure of steam butwill also torni a cushion for the water hammer or hydraulic throb causedin the pipes by the quick cutting ott of water when running, therebypreventing the bursting of the boilers from that cause. Y

My invention is especially adapted for use iu connection with kitchenrange boilers and it is its use with such boilers that I am now about todescribe.

A practical embodiment of my invention is represented in theaccompanying drawings in which Figure l is a vertical section throughthe valve, and Fig. 2 is a view showing its relation to a kitchen rangesystem of pipes.

A is an ordinary kitchen boiler supplied as usual with water through afeed pipe b from the water supply pipe B,

C is the circulating pipe which passes through the range for heating thewater.

l) is the hot water pipe through which hot water is delivered to allparts ot' the house.

E is an upright cylindrically bored casing containing the safety valves,the bottom of said casing being in communication with the Aupper part ofthe boiler and the upper part ot' said casing being in communication bya pipe Z2 with the Water supply pipe B. The bottom oi the said casin giscontracted to forni a valve-seat, the said contraction and seat beingrepresented as formed byabushinge. A short distance above this seatthere are in the sides of this valve casing E, a series of openings ewhich communicate with a hollow band `formed in the casing around itscylindrical Serial No. 429,743. (No model.)

bore. This band has lan outlet at c2 from which there is an overilowprovided through a pipe F represented as leading to the kitchen sink.The valve consists of a hollow cylin drical plunger c4 which is open atthe top and has a cushion fitted toit, the said cushion consisting ofany yielding body but represented as a piston c5 fitted to Work in theinterior of the hollow plunger and a spring es applied between the saidpiston and the bottom of the plunger or valve et. The latter is made ofa Weight to overcome the equilibrium of the pressure from within andwithout. It is deep enough to close the openings c while seated on theseat e3. The piston e5 is represented as furnished with a central guiderod eG which Works in a guide in a stationary bridge e7 in the upperpart of the valve casing E.

The operation is as follows: So long as the service pipe remainsunobstructed either by the freezing of the water within it, or by thecheck valve, when one is employed, the pressure being equal above andbelow the valve e4, the latter remains closed, but when by reason of theobstruction in the supply pipe any eX- cess of pressure that occurs inthe boiler through the generation of steam cannot be thrown back uponthe water main through the feed pipe b and supply pipe B, the valve islifted from its seat c3 and steam and water are allowed to escapethrough the openings c and the outlet e2 and pipe F, the cushion formedby the piston e5 and spring es allowing the valve to so opennotwithstanding that the water above in the pipe h will not yield. Thecushion formed by the piston c5 and spring eS also serves to relieve theboiler of the effect of what is termed the water hammer or hydraulicthrob produced by quickly shutting oft water from other parts of theservice.

It is obvious that a cushion similar in effect to the piston and springmight be made ot' a hollow water-tight rubber ball placed in the plungerci.

What l claim as my 'invention and desire to secure by Letters Patent is:

l. ln combination, a hollow cylindrical valve casio g open at top andbottom and having a lateral opening, a valve consisting of a hollowplunger fitted to said cylinder to open and close the bottom and lateralopenings of IOO said cylinder, a piston fitted to said hollow plungerand a springbetween said piston and the bottom of the plunger,substantially as herein set forth.

2. In combination, :L boiler, a, Water supply pipe and a feed pipeforming uninterrupted communication between the said supply pipe and theboiler, a valve-easing having lateral openings therein and having at itslower end 1o :t communication with the boiler and at its upper endcommunication with the supply pipe independently of the feed pipe, avalve for opening and closing Communication between the lower end andlateral openings of said valve easing, and an elastic cushion above l 5said valve, substantially as herein set forth.

THOMAS B. CLATWORTI-IY. lVitnesses:

FREDK. HAYNES, GEORGE BARRY.

